The others interrogated were ex-director (operations) at the Joint Operations Command Maj. Gen. Kumara Herath and former security forces commander of the western province Maj. Gen. Mano Perera.
Police headquarters said statements were recorded from the trio, for about four hours, with regard to suspicious telephone conversations that had taken place around the time Wickrematunga was killed.
Important information regarding the murder came to light during the interrogation, said the police headquarters.